Cushman & Wakefield is proud to present 20 Sunnyside Avenue, a premier office building in the heart of Mill Valley’s vibrant downtown. This trophy asset offers ±7,520 square feet of high-end office space and is currently 89.43% leased to a diverse roster of successful professional and medical tenants. Situated just steps from an array of top-tier restaurants, coffee shops, bars, and amenities, the property embodies the work-life balance that Mill Valley residents and professionals highly value. With strong in-place income and staggered lease expirations, 20 Sunnyside provides a rare opportunity to acquire a stabilized, institutional-quality asset with secure cash flow. The property is also strategically positioned to capitalize on Mill Valley’s growing office demand and anticipated near-term rent growth as market fundamentals in Marin County and the Greater Bay Area continue to strengthen. This offering represents a unique chance to invest in one of the Bay Area’s most supply-constrained and sought-after office markets.